This is a close-up shot of the inside rudder skins. This SW-P60G2 is really good stuff. It works pretty well and dries almost instantly!

Rudder stiffeners primed...'nuff said.

Stiffeners back-riveted to skin. I did a pretty crappy job of not scratching the outside skins on the back-rivet plate. No harm done...

Update: For the elevators, I actually back-riveted with the back-rivet plate resting on a 1/4 inch piece of plywood placed between two half-inch pieces of plywood. The back-rivet plate rests very flush with the 3/4 plywood and I managed to not scratch the elevators at all!